R1C9 can only be <9>
R2C1 can only be <2>
R4C9 can only be <1>
R7C8 can only be <1>
R2C3 can only be <7>
R3C2 can only be <4>
R3C4 can only be <3>
R1C2 can only be <5>
R2C9 can only be <3>
R5C9 can only be <4>
R8C9 can only be <7>
R5C8 can only be <6>
R4C7 can only be <2>
R7C5 can only be <6>
R9C8 can only be <8>
R1C8 can only be <2>
R8C7 can only be <5>
R5C2 can only be <9>
R7C2 can only be <3>
R3C8 can only be <7>
R3C7 can only be <8>
R6C7 can only be <7>
R5C1 can only be <5>
R5C5 can only be <1>
R9C2 can only be <2>
R6C1 can only be <3>
R7C6 can only be <5>
R1C5 can only be <8>
R6C5 can only be <9>
R7C3 can only be <4>
R8C3 can only be <1>
R1C7 can only be <6>
R3C5 can only be <2>
R4C5 can only be <3>
R1C6 can only be <4>
R2C7 can only be <1>
R9C1 can only be <9>
R4C3 can only be <6>
R9C5 can only be <7>
R8C4 can only be <9>
R9C3 can only be <5>
R8C1 can only be <8>
R8C6 can only be <2>
R2C4 can only be <6>
R9C4 can only be <1>
R6C6 can only be <6>
R2C6 can only be <9>
R4C4 can only be <5>
R6C4 can only be <4>
R4C6 can only be <8>
R6C3 can only be <2>